rHEALPix

Classification Miscellaneous
Available forms Forward and inverse, spherical and elliptical projection
Defined area Global
Alias rhealpix
Domain 2D
Input type Geodetic coordinates
Output type Projected coordinates
rHEALPix

rHEALPix is a projection based on the HEALPix projection. The implementation of rHEALPix uses the HEALPix projection. The rHEALPix combines the peaks of the HEALPix into a square. The square’s position can be translated and rotated across the x-axis which is a novel approach for the rHEALPix projection. The initial intention of using rHEALPix in the Spatial Computation Engine Science Collaboration Environment (SCENZGrid).

Usage

To run a rHEALPix projection on a WGS84 ellipsoidal model, use the following command:

proj +proj=rhealpix -f '%.2f' +ellps=WGS84 +south_square=0 +north_square=2  -E << EOF
> 55 12
> EOF
55 12   6115727.86  1553840.13

Parameters

Note

All parameters for the projection are optional.

+north_square

Position of the north polar square. Valid inputs are 0–3.

Defaults to 0.0.

+south_square

Position of the south polar square. Valid inputs are 0–3.

Defaults to 0.0.

+lon_0=<value>

Longitude of projection center.

Defaults to 0.0.

+ellps=<value>

See proj -le for a list of available ellipsoids.

Defaults to “GRS80”.

+x_0=<value>

False easting.

Defaults to 0.0.

+y_0=<value>

False northing.

Defaults to 0.0.

Further reading

  1. NASA
  2. Wikipedia